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Old 15th May 2013, 05:38 PM   #4241
lhquam is offline lhquam  United States
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I am still here, watching for rare pearls of wisdom.


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Where is lhquam? He is off the diyaudio grid; noting that he pioneered quite a bit of diyF6.
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Old 15th May 2013, 05:40 PM   #4242
generg is offline generg  Germany
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so you are a chain of pearls......
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Old 15th May 2013, 09:09 PM   #4243
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Originally Posted by lhquam View Post
I am still here, watching for rare pearls of wisdom.
I am glad you are still in the loop. There was time you were interested in MOSFETs instead of R100s. Did you abandon this potential changeover? What is is the future direction of diyF6? It seems that dual PSUs are for the time being per the recent threads? The Vbe of a power Darlington is ~ like that for Vgs of R100. Is a Darlington a justifiable way to proceed in light of the scarcity of R100?
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Old 15th May 2013, 09:16 PM   #4244
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Wow.
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Old 15th May 2013, 09:36 PM   #4245
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Quote:
Originally Posted by Antoinel View Post
Is a Darlington a justifiable way to proceed in light of the scarcity of R100?
Why not use IRFP240? Or Fairchild 16N25 that you can get from buzzforb.

The information on the (minor) changes it takes to use those devices is in this blog post-

http://www.diyaudio.com/forums/blogs...-pcb-blog.html
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Old 15th May 2013, 10:24 PM   #4246
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Originally Posted by 6L6 View Post
Why not use IRFP240? Or Fairchild 16N25 that you can get from buzzforb.

The information on the (minor) changes it takes to use those devices is in this blog post-

http://www.diyaudio.com/forums/blogs...-pcb-blog.html
Thanks 6L6. I already have Tea-Bag's PCBs; they are impressive and NASA quality. And I am looking forward to buzzforb's kit for diyF6. Allow me to stir up this pot further. DiyF6, diyF5, and diy BA3 Front End use the familiar SK/SJ pair. Their use is by far the simplest and most elegant /practical approach. But the future of this SK/SJ pair is uncertain, costly and forcing our supplying diyers to match'em up. It is time to consider using other readily available alternatives. BUF634 and LH0002 are potential candidates; plus your choice of others. The future of diyF6 is bleak. Its principal semiconductors can only become scarcier and more expensive. Aside from Mr. Pass, the only diyers who are known to have diyF6 are Zen Mod, lhquam, flochinni, generg, Tea-Bag and buzzforb. Needed are new pcbs for the aforementioned diys amps to flow with this changing world of diy semis.
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Old 15th May 2013, 10:44 PM   #4247
6L6 is offline 6L6  United States
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Originally Posted by Antoinel View Post
DiyF6, diyF5, and diy BA3 Front End use the familiar SK/SJ pair. Their use is by far the simplest and most elegant /practical approach. But the future of this SK/SJ pair is uncertain
The Linear J74 is real. It's just not to solid production yields yet.

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The future of diyF6 is bleak. Its principal semiconductors can only become scarcer and more expensive.
Although I agree with you concerning the R100, the Jfet input pair is only going to have more availability in the near future. We currently are in the drought before the rain.

Other output devices fork for the F6, and according to the people who have built it, the magic is in to topology, not necessarily the power fets.

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Aside from Mr. Pass, the only diyers who are known to have diyF6 are Zen Mod, lhquam, flochinni, generg, Tea-Bag and buzzforb.
That is true, but only because the rest of us are all waiting for transformer group buys.


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Needed are new pcbs for the aforementioned diys amps to flow with this changing world of diy semis.
A fantastic idea! Can we nominate you to spearhead that? I'm sure there are people who know PCB layout who are very willing to help. Just ask.
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Old 15th May 2013, 10:45 PM   #4248
lhquam is offline lhquam  United States
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So far I am only seeing the perils of part extinction.

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so you are a chain of pearls......
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Old 15th May 2013, 10:53 PM   #4249
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It is getting away from the original design in some ways, but i thkn mulitple pairs of Exicon laterals would be very interesting. I tried the laterals in my first iteration and continue to like them. You will simply have to parallel them to get the current and gain capability up. THis is assuming that you need it, as I believe they would fit into the FW mold as they are. I am listening to a bjt based amp, the TSSA, that uses them and they sound wonderful. I will probably use them in my M2 attempt. THey have the benefit of having a temp coefficient that allows dumping of the Rs. In this as well as in their tendency towards better linearity, they have similar potential.
Plus,its not the parts. I believe Nelson using mosfets was a bit of a step away from the norm. Heading back to the swine pen for a while.
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Old 15th May 2013, 11:09 PM   #4250
lhquam is offline lhquam  United States
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It is getting away from the original design in some ways, but i thkn mulitple pairs of Exicon laterals would be very interesting. ...
Are the Exicon laterals any easier to find than the SemiSouth R100s?
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